There seems to be a problem with it
Normal (TN3270 traffic originating from the relay host):
10:44:29.667165 IP doylebrunson.ailife.com.46318 > 10.1.9.2.verismart: S 707994026:707994026(0) win 5840 <mss 1460,sackOK,timestamp 1913051656 0,nop,wscale 7>
10:44:29.685075 IP 10.1.9.2.verismart > doylebrunson.ailife.com.46318: S 1665830401:1665830401(0) ack 707994027 win 33396 <mss 1452,nop,wscale 0,nop,nop,timestamp 6736695 1913051656>
10:44:29.685137 IP doylebrunson.ailife.com.46318 > 10.1.9.2.verismart: . ack 1 win 46 <nop,nop,timestamp 1913051674 6736695>
10:44:29.707089 IP 10.1.9.2.verismart > doylebrunson.ailife.com.46318: P 1:4(3) ack 1 win 33396 <nop,nop,timestamp 6736695 1913051656>
10:44:29.707147 IP doylebrunson.ailife.com.46318 > 10.1.9.2.verismart: . ack 4 win 46 <nop,nop,timestamp 1913051696 6736695>
Relayed:
10:44:04.362686 IP it-304.ailife.com.bts-appserver > 10.1.9.2.verismart: S 3483673038:3483673038(0) win 65535 <mss 1460,nop,nop,sackOK>
10:44:07.294923 IP it-304.ailife.com.bts-appserver > 10.1.9.2.verismart: S 3483673038:3483673038(0) win 65535 <mss 1460,nop,nop,sackOK>
...and the client times out (The TN3270 server is running on port 3270/verismart).
Any ideas?
Frank M. Ramaekers Jr.
Systems Programmer MCP, MCP+I, MCSE & RHCE
American Income Life Insurance Co. Phone: (254)761-6649
1200 Wooded Acres Dr. Fax: (254)741-5777
Waco, Texas 76710
-----Original Message-----
From: centos-bounces@xxxxxxxxxx [mailto:centos-bounces@xxxxxxxxxx] On Behalf Of Vahur Jõesalu
Sent: Thursday, April 24, 2008 9:27 AM
To: CentOS mailing list
Subject: Re: TCP/IP Port Relay
hmm, if I understood you correctly, then this should work just fine (on
linux firewall):
/sbin/iptables -t nat -I PREROUTING -p tcp --dport 23 -j DNAT \
--to telnetserverip:port-number
/sbin/iptables -I FORWARD -i external_interface -o internal_interface \
-p tcp -d telnetserverip --dport portnumberontelnetserver -j ACCEPT
after a reboot or firewall service restart it's gone again.
-vahur
Frank M. Ramaekers wrote:
> What is the best way to temporarily setup a port relay. I'm trying to
> diagnose a problem with Cisco's latest VPN client and need to determine
> if the problem is port number related.
>
> e.g. VPN client---------23-(Linux box to relay port)-------xx-(Telnet
> server)
>
> (Keep in mind this is temporary and for debugging purposes)
>
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